AC and humidity problems.

You WANT that water to run off the roof away from your AC. If it's running water off with high humidity outside it's working. If the drain becomes clogged water will back up into the camper thru the unit itself. If is humid outside and no water is running inside or outside then the unit is freezing up. It's not running fast enough to stay thawed. Run on high fan for a while to circulate enough warm air to thaw it out then set it on high cool. My AC tech told me a long time ago when we had this problem in a 5er to always run the AC on high in high humidity, just turn the cold control to warmer if it's too cold in the camper. Only run on low fan when the humidity outside is low. Since I've followed that rule we've had no further problems in any camper we've owned. I always check the drain for bug obstructions frequently if there's no water running and after each long term storage time. Keeping the filters really clean on your inside part of the unit makes a difference as well. At least that's our experience with 13,500s and now the 9200s and 16 years with camper ACs.